2名韩国人质被释放(1)
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科学60秒:人气王主导网络论坛
When the internet first ___1___, some scholars of democracy and civil society thought that online discussions could create what they called a “___2___”: an ongoing town hall without bricks and ...
科学60秒:神奇油画复原帮手:细菌
A painting that was once a masterpiece can lose its ___1___ after centuries of exposure to the elements. Its true hues may become ___2___ by grime and even buildups of salt. But now researchers i...
科学60秒:牡蛎味鲜美 环保价更高
The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters. For decades, the Chesapeake has been ___1___ by excess nutrients, such as nitrogen, from agricultural and munici...
世卫促各国不要放松防范流感戒备 (1)
Hints:Keiji FukudaThe World Health Organization says people should not focus too much on the figures, as they are fluid and change with great frequency. It says the influenza A H1N1 virus is cont...